AJ ONeal 831ab0752e
feat(net/httpcache): ETag/Last-Modified HTTP cache for periodic data
New package for fetching files from HTTP with conditional-GET semantics
and a sidecar metadata file that persists ETag/Last-Modified across
restarts. Splits connection vs download timeouts, supports custom auth
headers (stripped on cross-origin redirect), and exposes sentinel errors
for callers branching on failure mode. Integration tests included.
2026-04-30 16:48:44 -06:00
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